Sr Principal Software Engineer

RELOCATION ASSISTANCE: Relocation assistance may be available CLEARANCE REQUIRED FOR START: Yes CLEARANCE TYPE: Top Secret TRAVEL: Yes, 10% of the Time Description At Northrop Grumman, our employees have incredible opportunities to work on revolutionary systems that impact people's lives around the world today, and for generations to come. Our pioneering and inventive spirit has enabled us to be at the forefront of many technological advancements in our nation's history - from the first flight across the Atlantic Ocean, to stealth bombers, to landing on the moon. We look for people who have bold new ideas, courage and a pioneering spirit to join forces to invent the future, and have fun along the way. Our culture thrives on intellectual curiosity, cognitive diversity and bringing your whole self to work — and we have an insatiable drive to do what others think is impossible. Our employees are not only part of history, they're making history. Northrop Grumman Aeronautics Systems is seeking a Senior Principal Software Engineer to join our team on site in San Diego, CA or Oklahoma City, OK . The ideal candidate is a self-starter with experience working in an Integrated Product Team (IPT) environment. In this role, you will be a key member of the Models & Simulation team, leading the planning, integration, and delivery of software releases, as well as diagnosing and resolving complex technical issues. Roles and Responsibilities will include: Provide technical leadership for the development, implementation, and maintenance of modular simulation and modeling software (e.g., C++, Python), guiding the team in architecture, standards, and best practices. Lead the integration of simulation components with system interfaces, middleware, and test harnesses; establish integration strategies and ensure interoperable data flows and real-time performance across the team. Define and oversee verification and validation strategies, review test plans and results, and direct the resolution of defects to ensure model fidelity, accuracy, and traceability to requirements. Drive performance and scalability optimization efforts; set priorities for profiling and tuning, reduce latency, and champion CI/CD pipelines for automated builds, testing, and deployments. Coordinate with systems engineers, testers, and stakeholders to translate requirements into simulation capabilities and scenarios; review and approve technical documentation; and lead technical presentations and demonstrations. The selected candidate will be required to work full-time, on-site at our facility.  There is no remote / hybrid / telework available for this position. Travel up to 25% may be required. Basic Qualifications: •Bachelor’s Degree in a STEM (Science, Technology, Engineering or Mathematics) discipline and 8 years of related engineering experience; OR a Master’s degree in a STEM discipline and 6 years of related engineering experience; OR a PhD in a STEM discipline and 4 years of related engineering experience. •Experience with the full SW Development Life Cycle (SDLC) •Experience with the following programming and scripting languages: C/C++, and Python •Experience with developing multi-threaded SW •Experience with two of the following tools: Jira, Crucible, Bitbucket, Gitlab, Subversion, Bamboo, Jenkins, Sonarqube, Fortify, or Coverity •Experience with Agile SW development, embedded system programming, SW integration and testing •Familiarity with at least one of the wire data interfaces: 1553, 1394, Serial, CAN, Ethernet/IP, or Fibre Channel, etc. •Excellent communication, interpersonal skills, and the ability to interface with all levels of employees and management •Experience and proficiency in software architecture, design, implementation, integration, and debugging C++ SW running on Real-Time Operating systems such as: VxWorks, Integrity, AND/OR Real Time Embedded Linux. •Ability to collaborate with systems engineers,